If air contaminants from a single source operation are emitted through two or more emission points, the total emitted
quantity of air contaminants cannot exceed the quantity which would be allowable through a single emission point.
The total emitted quantity of any such air contaminant shall be taken as the product of the highest concentration
measured in any of the emission points, unless the person responsible for the source operation establishes the
correct total emitted quantity to the Air Pollution Control Officer's satisfaction.